US Bridges

HWY 100 over Sandy River

FairPosted for load

Multnomah County, Oregon · At Troutdale · Structure no. 02019 125 00185

Built
1912
113 years old
Condition
Fair
inspected September 2024
Type
Truss - Thru
Steel
Length
366 ft
2 main spans
Daily traffic
2,324
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 100 over Sandy River is a steel truss - thru carrying HWY 100 over Sandy River in Multnomah County, Oregon. It was built in 1912, so it is 113 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 2,324 vehicles a day, roughly 9% of them trucks, projected to reach 3,900 by 2042. The structure is 366 ft (111.6 m) long and 24 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesHWY 100
CrossesSandy River
LocationAt Troutdale
RouteState Highway 30
CountyMultnomah County
StateOregon
Coordinates45.53843, -122.37668
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating12.5 US tons
Inventory rating9.6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+1 approach)
Design loadHS 15
Structure length366 ft (111.6 m)
Longest span163 ft (49.7 m)
Deck width24 ft (7.2 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deck16 ft (4.9 m)

Traffic and service

Average daily traffic2,324 (2022)
Projected traffic3,900 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.9 million
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY 100 over Sandy River built?

It was built in 1912, making it 113 years old in 2025.

What condition is HWY 100 over Sandy River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does HWY 100 over Sandy River carry?

About 2,324 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is HWY 100 over Sandy River?

The structure is 366 ft (111.6 m) long with a longest span of 163 ft (49.7 m) and a deck 24 ft wide.

Who owns HWY 100 over Sandy River?

It is owned by the State Highway Agency.